[英]SQL: To Copy data from one column to another in same table by joining and then delete
嘗試將數據從1列復制到另一列時出現錯誤,因為有2行數據幾乎相同,但具有唯一ID。 我使用了select語句,該語句可以很好地選擇要從train_date復制到del_date列的特定日期,但要選擇where語句中的條件。 如何將數據復制到預定日期,然后刪除train_date行。 謝謝
update dbo.Comp d
set d.del_date = t.train_date
(
SELECT d.unique_id as delUnique
,t.unique_id as TraUnique
,d.del_date as delDelDate
,t.del_date as traDelDate
,d.train_date as delTrainDt
,t.train_date as traTrainDt
FROM dbo.Comp d
inner join dbo.Comp t on d.g_id = t.g_id
where t.del_date = d.train_date
and t.unique_id <> d.unique_id
order by d.og_id, d.g_id
嘗試這個,
update d
set d.del_date = t.train_date
FROM dbo.Comp d
inner join dbo.Comp t on d.g_id = t.g_id
where t.del_date = d.train_date
and t.unique_id <> d.unique_id
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